var tablesToMigrate = 0;

                var migratedTables = 0;

                var cycleCompleted = false;

                var anyError = false;

                for (var file in filesByName) if (filesByName.hasOwnProperty(file)) {

                  tablesToMigrate++;

                  this._migrateTable(

                    transaction,

                    name,

                    filesByName[name],

                    sqlError => {

                      if (error) {

                        anyError = true;

                        callback(wrapSQLError(error), null);

                        return;

                      }

                      migratedTables++;

                      if (!anyError && migratedTables === tablesToMigrate && cycleCompleted)

                        callback(null, new UpdateStorage(this._db));

                    });

                }

                cycleCompleted = true;

                if (!anyError && migratedTables === tablesToMigrate)

                  callback(null, new UpdateStorage(this._db));

              });

          },

          sqlError => callback(wrapSQLError(sqlError), null));

      }

      private _dropAllTables(transaction: SQLTransaction, callback: (error: SQLError) => void) { 

        throw null;

      }

      private _migrateTable(

        transaction: SQLTransaction,

        file: string,

        properties: { [name: string]: string; },

        callback: (error: SQLError) => void) { 

        throw null;

        // CREATE TABLE

        for (var propertyName in properties) if (properties.hasOwnProperty(propertyName)) {

          var value = properties[propertyName];

        }

      }

      private _processTableNames(transaction: SQLTransaction, result: SQLResultSet, recipient: LoadStorageRecipient) {

        var length = result && result.rows ? result.rows.length : 0;

        var ftab = this._extractFileNames(result);

        if (!ftab.length){

          recipient.completed(new UpdateStorage(this._db));

          return;

        }

        var anyError = false;

        var reportedFileCount = 0;

        ftab.forEach(ft=> {

          transaction.executeSql(

            'SELECT * FROM "' + ft.table + '"',